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Line level - Wikipedia
https://en.wikipedia.org/wiki/Line_level#:~:text=The%20voltage%20can%20reach%202%20volts%20peak-to-peak%20with,corresponds%20to%20the%20conventional%20range%20of%20human%20hearing.
What is the voltage range of a standard headphone jack ...
https://electronics.stackexchange.com/questions/28404/what-is-the-voltage-range-of-a-standard-headphone-jack-from-a-phone
The most common nominal level for consumer audio equipment is −10 dBV, ... Expressed in absolute terms, a signal at −10 dBV is equivalent to a sine wave signal with a peak amplitude of approximately 0.447 volts, or any general signal at 0.316 volts root mean square (VRMS). ...
Headphone Jack and Plugs: Everything You Need to …
https://www.headphonesty.com/2019/04/headphone-jacks-plugs-explained/
If I understand it correctly, unbalanced line level audio is all positve voltage, from +0.2 volts up to +1.8 volts, allowing the next piece of gear to use a single sided amp. Main reason: transistors can only amplify positive voltage.
headphones - Understanding voltage levels on 3.5 mm audio ...
https://electronics.stackexchange.com/questions/298573/understanding-voltage-levels-on-3-5-mm-audio-output
In the hope of using the standard 3.5mm audio output found in your average PC/smartphone to control (not power) a DC motor, I was measuring the voltage between GND and Tip and noticed the following: When no audio is playing, there's a voltage of about 2 mV.
3.5 mm Headset Jack: Device Specification | Android Open ...
https://source.android.com/devices/accessories/headset/jack-headset-spec
Maximum output voltage drive: 150mV >= 150mV on 32 ohm Test conditions: EN50332-2. Mic bias resistance: Required: Flexible on detection method used and microphone bias resistor selection. Require that all button resistance value ranges specified below be detected and related to their respective function: Mic bias voltage: 1.8V - 2.9V
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